Obituary notices: Sir William Crookes, O.M., 1832–1919; Thomas Fairley, 1843–1919; Walter William Fisher, 1842–1920; Antoine Paul Nicolas Franchimont, 1844–1919; Harold Cecil Greenwood, 1887–1919; Charles Edward Groves, 1841–1920; John Holmes, 1871–1919; Sir Boverton Redwood, Bart., 1846–1919; John Charles Umney, 1868–1919